PSA density stays flat with age in healthy men — PSA does not

Design

Population-based cohort with MRI and deep-learning prostate segmentation

Population

1037 German men without known prostate disease, median age 46

Primary outcome

Reference percentiles for prostate volume, PSA and PSA density

Effect

95th percentiles: volume 51.4 mL, PSA 2.79 ng/mL, PSA density 0.071 ng/mL²

A German population study drew on 1037 men without known prostate cancer, benign hyperplasia or urinary symptoms, all with pelvic MRI, to build reference curves for prostate volume, PSA and PSA density. Volumes were measured with deep-learning segmentation, checked against manual measurement.

Median prostate volume was 31 mL, PSA 0.81 ng/mL and PSA density 0.025 ng/mL². PSA and volume rose steadily with age, but PSA density was much more stable, and its age-adjusted value never exceeded 0.11 ng/mL². Its 95th percentile was 0.071. Higher BMI was linked to larger prostates and lower PSA density.

The study supports PSA density as a more age-robust marker than PSA alone when deciding who needs further assessment after prostate MRI. These are reference values from a largely middle-aged northern European population, and they do not define a biopsy threshold. Indian reference data are lacking.

• Calculate PSA density from MRI prostate volume in every prostate MRI report where PSA is known.
• Note that PSA density above about 0.07 ng/mL² was above the 95th percentile for healthy German men.
• Use PSA density rather than raw PSA when comparing older men, since PSA rises with age and density does not.
• Remember that higher BMI was linked to larger glands and lower PSA density.

Why it matters

It supports giving PSA density more weight than raw PSA when interpreting MRI in older men.

Don't overread it

These are population reference values, not validated cut-offs for biopsy decisions, and come from a European population.

The statistics, in plain English

The 95th percentile is the value below which 95% of healthy men fell. A result above it is unusual for a healthy man, but not by itself evidence of cancer.

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